Speaking as a Canadian, the Bush presidency was certainly wince-inducing. I was genuinely surprised he got re-elected after that clusterfuck of a first term. By the end of the 2nd, I was fairly convinced the best days of America were behind it.
But the difference between him and Trump is the wounds were more self-inflicted on the country with Bush. Still not great for Canada, whose fortunes rise and fall on what happens on the other side of the border.
But Trump had a genuine animosity for freedom-loving, democracy-respecting American allies and a love for oppressive dictatorships. He tore up trade agreements, levelled tariffs, etc. against Canada and Europe while advancing diplomacy in person in the likes of North Korea.
And on a more social level, he poisoned public discourse and stoked right-wing authoritarianism all over the world. I have family members I can't talk to anymore. And the lunatic fringe came out of the woodwork under his term. We even had a mosque shooter here in Canada who was quite candid about Trump being his inspiration.
Within the US, Americans hate Americans with a passion. What a mess. Another civil war is not out of the question. As such, I am coming down on Trump being far, far worse.